Chapter 399: Sunshine is Also a Disaster

Gu Pan and Lu Ruisheng didn't quite understand, so they looked towards Chen Shaonan, hoping to hear his explanation.

Chen Shaonan said to them, "The intensity of ultraviolet rays is divided into five levels: very weak, weak, moderate, strong, and very strong. Level 1 has an index of 0-2, Level 2 has an index of 3-4, Level 3 has an index of 5-6, Level 4 has an index of 7-9, and Level 5 has an index of 10 and above. If it's more than 10, it can be very harmful to humans."

After saying this, Chen Shaonan paused, then continued, "Low-level ultraviolet radiation exposure can cause erythema, swelling, and pain to the skin. However, if the wavelength of UVA reaches the dermis and stimulates melanin particles, it will lead to blisters, peeling, pigmentation, and other issues. And if it gets more serious, it can lead to basal cell carcinoma, malignant melanoma, and other types of skin tumors."